Torsional Oscillator measurements of multiply connected monolayer 4He films under high speed rotation up to 4.0 rev./s

Author: Obata Toshiaki   Tanuma Itsumi   Igarashi Takeshi   Kubota Minoru  

Publisher: Springer Publishing Company

ISSN: 0022-2291

Source: Journal of Low Temperature Physics, Vol.138, Iss.3-4, 2005-02, pp. : 929-934

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Abstract

We are studying the physical phenomena of superfluid thin films adsorbed on multiply connected surface of porous glasses under high speed rotation. The combination of thin superfluid 4He films on large pore porous surfaces and high-speed rotation gives rise to a new quantum vortex excitation, where vortex lines are pinned on the center of pores and have the “core” at the pore. This excitation has been predicted and named as a “pore vortex”. We are trying to measure the behavior of pore vortices using the Torsional Oscillator (TO) technique and we have succeeded in making measurements up to the high-speed rotation of 4.0 rev./s. Here we report the actual design of the TO set up.

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